Walcott, 1908
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Walcott, C.D., 1908: Cambrian geology and paleontology. Smithsonian Miscellaneous Collection, v.53, no.1, 296 p.
Walcott, C.D., 1908: Cambrian geology and paleontology. Smithsonian Miscellaneous Collection, v.53, no.1, 296 p.